... But average reliability over time. After two years of use, no copy of my screw has come loose, compromising the security of the whole housing / lens when it is mounted on foot. By means of the glue, I could find a solution to the problem, also thanks to a mounting plate Manfrotto left permanently on the adapter. In short, this product made in China has a value interesting, but it is potentially dangerous, the screw is not securely fastened and could bring down the camera equipment to the ground when no suspect .. .